Allegro MicroSystems公司的A6862是N沟功率MOSFET驱动器,具有三个独立的浮置栅极驱动输出,集成的电荷泵控制器稳压器在电源电压降至4.5V时有足够的栅极驱动电压大于7.5V,电源电压4.5V-50V,两个单独的激励输入,单个相位使能输入,主要用在ASIL系统的三相断开,电动助力转向系统(EPS),电制动和三相固态继电器驱动器.本文介绍了A6862主要特性和优势,框图,典型应用框图,以及演示板电路图,材料清单和PCB设计图.
The A6862 is an n-channel power MOSFET driver capable?of controlling MOSFETs connected as a 3-phase solid-state?relay in phase-isolation applications. It has three independent?floating gate drive outputs to maintain the power MOSFETs in?the on-state over the full supply range with high phase-voltage?slew rates. An integrated charge pump regulator provides the?above battery supply voltage necessary to maintain the power
MOSFETs in the on-state continuously when the phase voltage?is equal to the battery voltage. The charge pump will maintain?sufficient gate drive (>7.5 V) for battery voltages down to 4.5 V?with 100 kΩ gate source resistors.
The three gate drives can be controlled by a single logic-level?input. In typical applications, the MOSFETs will be switched?on within 8 μs and will switch off within 1 μs.
Two independent activation inputs can be used to put the A6862?into a low-power sleep mode with the charge pump disabled.?Undervoltage monitors check that the pumped supply voltage?and the gate drive outputs are high enough to ensure that the?MOSFETs are maintained in a safe conducting state.
The A6862 is supplied in a 16-lead TSSOP (LP) with exposed?pad for enhanced thermal dissipation. They are lead (Pb) free,?with 100% matte-tin leadframe plating.
A6862主要特性和优势:
? Three floating n-channel MOSFET drives
? Maintains VGS with 100 kΩ gate-source resistors
? Integrated charge pump controller
? 4.5 to 50 V supply voltage operating range
? Two independent activation inputs
? Single phase-enable input
? VCP and VGS undervoltage protection
? 150°C ambient (165°C junction) continuous
A6862应用:
? 3-phase disconnect for ASIL systems up to level D
? Electric power steering (EPS)
? Electric braking
? 3-phase solid-state relay driver
图1. A6862框图
图2. A6862典型应用框图
图3. A6862演示板外形图
图4. A6862演示板电路图
A6862演示板材料清单:
图5. A6862演示板PCB设计图(1)
图6. A6862演示板PCB设计图(2)
图7. A6862演示板PCB设计图(3)
图8. A6862演示板PCB设计图(4)